GM Astro/Safari 1985-1996 Repair Guide

Valve Seats


See Figure 1

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Fig. Fig. 1: Machine shops will check valve seat concentricity using a special dial gauge

The valve seats are cast into the cylinder head(s) and cannot be replaced; the seats can be machined during a valve job to provide optimum sealing between the valve and the seat. Valve seat concentricity should be checked by the machine shop, using special dial gauge.

The seating services should be performed by a professional machine shop which has the specialized knowledge and tools necessary to perform the service.